Month: June 2016

A spacecraft designed to sample an asteroid and return that sample to Earth will depend greatly on its communications systems with Earth to relay everything from its health and status to scientific findings from making a detailed survey of the asteroid known as Bennu. That’s why engineers from NASA’s Deep Space Network spent the past couple of weeks performing detailed tests of the various communications systems on the OSIRIS-REx spaceraft.

More than a simple on-off evaluation, the tests call for analyses that simulate the millions of miles of distance that signals from the spacecraft will have to traverse to reach the gigantic antennas of the Deep Space Network placed in California, Spain and Canberra, Australia. With dishes measuring up to 230 feet in diameter, the Earthbound communications network is geared to pick up faint transmissions from probes that are exploring the solar system.

The recent tests were completed inside a long, single-story building at Kennedy known as MIL-71. Its name harkens back to the time when Kennedy was known as the Merritt Island Launch Annex, or MILA. Communications systems allow only three letters, so it was shortened the MIL. In much the same way, the asteroid sampling mission called OSIRIS-REx by its management is known in Deep Space Network and communications circles by its own three-letter acronym, ORX.

It takes a roomful of specialized gear to perform the testing which calls for simulating the vast distances of space though the spacecraft and instruments are in buildings next door to each other. The team heads back to California soon to apply their work to the system and get ready to use it for launch.

They won’t know until about 20 minutes after liftoff whether their testing was performed correctly and the spacecraft will effectively communicate with Earth. It is around that time that the OSIRIS-REx will separate from the upper stage of the Atlas V rocket. Assuming they get a signal like they expect, the spacecraft will unfurl its solar arrays and head for the asteroid, keeping Earth updated to the progress throughout its journey. Photo credit: NASA/ Dimitri Gerondidakis

At NASA’s Kennedy Space Center in Florida, preparations are underway to launch a mission to an asteroid that may hold clues to the origin of the solar system and the source of water and organic molecules found on Earth.

The Origins, Spectral Interpretation, Resource Identification, Security–Regolith Explorer, or OSIRIS-REx, spacecraft arrived at the spaceport from Buckley Air Force Base near Denver aboard an Air Force C-17, touching down on May 20 at the Shuttle Landing Facility. Since that time, the spacecraft was moved to the Payload Hazardous Servicing Facility where technicians and engineers removed it from its shipping container the next day and connected it to a rotation fixture for spin balance testing.

A test of the OSIRIS-REx solar array deployment mechanism recently was conducted along with inspection, cleaning and functional testing of the arrays. An interface test with the Deep Space Network currently is underway.

Targeted for liftoff at 7:05 p.m. EDT, Sept. 8, 2016, aboard a United Launch Alliance Atlas V rocket, OSIRIS-REx will be the first U.S. mission to sample an asteroid, retrieve surface material and return it to Earth for study.

After OSIRIS-REx arrives within three miles of the asteroid, Bennu, the spacecraft will begin six months of comprehensive study and mapping of the surface.

The science team then will select a location where the spacecraft’s arm will take a sample. The spacecraft gradually will move closer to the site, and the arm will extend to collect at least a 2.1-ounce sample for return to Earth in 2023.